I would be grateful for some details – which are the facts that I neglected to look up, specifically on Wikipedia?

The novel was written in 2005 and I consulted countless books and other media in order to describe two Jewish families in the 1930s and 1940s as credibly as possible. A good deal of the two years of writing this novel (the German original being much longer than the American edition) was spent on research in Berlin and London. Before going into print, the finished novel was read and approved by two scholars with a degree in Judaism. One of them spent most of her life in Israel.

I am very sorry for any mistake which remained in the book, also for maybe not quite catching the spirit of being Jewish in Britain in the 1940s.